28"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 9.75"h] Aluminum + Product Details Size –

+ Product Details Size – 50"w X 20"h is the size for the duct opening measurement only

With a 8" diameter for the duct opening measurement

Center Core is Removable for Easy Access and Maintence

Actual Filter Size – 7 3/4"w x 11 3/4" x 1"

28"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 9.75"h] Aluminum + Product Details Size –+ Product Details Size 28"w X 8"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 29. 75" Width X 9. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never wear